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A New Technique for Modeling Land Subsidence Facilitates Better Groundwater Management

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A New Technique for Modeling Land Subsidence Facilitates Better Groundwater Management
Stanford Woods Institute for the Environment and the Bill Lane Center for the American West | December 1, 2019...
Summary
Land subsidence – the sudden sinking or gradual settling of Earth’s surface – can occur naturally or be triggered by human activity. One of...

Land subsidence – the sudden sinking or gradual settling of Earth’s surface – can occur naturally or be triggered by human activity. One of the most common human-affected factors is groundwater pumping, a practice that has been steadily increasing due to prolonged periods of drought. Groundwater pumping is so prevalent in some areas that it is severely compromising the quantity and quality of the groundwater as well as the physical structure of the land and aquifer capacity beneath it. Large-scale initiatives for putting water back into the ground, or groundwater recharge, are being implemented in some regions. However, groundwater resource managers still need better information to determine where the land is at greatest risk of subsidence as well as where recharge efforts would be the most effective. Integrating two reliable data gathering sources – helicopter-deployed systems (airborne electromagnetic or AEM technology) that measure electromagnetic fields and satellite-deployed systems (interferometric synthetic aperture radar or InSAR) to measure deformations – offers groundwater managers an improved method for more accurately modeling changes in the land surface related to the pumping and recharge of groundwater. Additionally, the ability to more precisely detect subsidence may offer an early warning system for declining groundwater levels.

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Advancing Strategic Land Repurposing and Groundwater Sustainability in California

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Advancing Strategic Land Repurposing and Groundwater Sustainability in California
Environmental Defense Fund (EDF) | March 26, 2021...
Summary
For decades, California has been on a steady trajectory toward water scarcity, which is now exacerbated by climate change. More frequent and intense droughts and increased...
For decades, California has been on a steady trajectory toward water scarcity, which is now exacerbated by climate change. More frequent and intense droughts and increased demands have affected the reliability of surface water supplies. As a result, many have looked to groundwater to fill the gap. Groundwater overpumping has resulted in adverse impacts such as reduction in groundwater storage, subsidence, water quality degradation, sea water intrusion, wells going dry and depletion of interconnected surface waters throughout many areas in California’s San Joaquin Valley. These impacts led to the passage of the Sustainable Groundwater Management Act (SGMA) by the state Legislature in 2014, which mandates sustainable use of groundwater by 2040 for the most critically overdrafted basins.

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Aliso Water District Groundwater Sustainability Plan

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Aliso Water District Groundwater Sustainability Plan
Aliso Water District Groundwater Sustainability Agency | January 17, 2020...
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Amargosa Desert Hydrographic Basin 14-230 Groundwater Pumpage Inventory Water Year 2015

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Amargosa Desert Hydrographic Basin 14-230 Groundwater Pumpage Inventory Water Year 2015
State of Nevada | July 31, 2015...
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Analysis of Potential Water-Supply Management Options, 2010-60, and Documentation of Revisions to the Model of the Irwin Basin Aquifer System, Fort Irwin National Training Center, California
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Analysis of Potential Water-Supply Management Options, 2010-60, and Documentation of Revisions to the Model of the Irwin Basin Aquifer System, Fort Irwin National Training Center, California
U.S. Geological Survey (USGS), Fort Irwin National Training Area | October 31, 2014...
Summary
The Fort Irwin National Training Center is considering several alternatives to manage their limited water-supply sources in the Irwin Basin. An existing three-dimensional,...
The Fort Irwin National Training Center is considering several alternatives to manage their limited water-supply sources in the Irwin Basin. An existing three-dimensional, finite-difference groundwater-flow model—the U.S. Geological Survey’s MOD-FLOW—of the aquifer system in the basin was updated and the initial input dataset was supplemented with groundwater withdrawal data for the period 2000–10. The updated model was then used to simulate four combinations, or scenarios, of groundwater withdrawal and recharge over the next 50 years (January 2011 through December 2060). The scenarios included combinations of continuing withdrawals from currently active production wells, supplementing any increases in demand with withdrawals from an inactive production well, reducing withdrawal amounts and rates, and reducing the discharge of treated wastewater to infiltration ponds that provide a recharge source to the underlying aquifer. Results of the simulations indicated that, depending on the scenario implemented, groundwater levels would rise (over the next 50 years) from 40 feet to as much as 65 feet in the northwestern part of the Irwin Basin, and from 5 feet to 10 feet in the southeastern part.

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Aquifer-system compaction and land subsidence: Measurements, analyses, and simulations-the Holly Site, Edwards Air Force Base, Antelope Valley, California

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Aquifer-system compaction and land subsidence: Measurements, analyses, and simulations-the Holly Site, Edwards Air Force Base, Antelope Valley, California
U.S. Geological Survey (USGS) | July 1, 2000...
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At Risk: Public Supply Well Vulnerability Under California’s Sustainable Groundwater Management Act

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At Risk: Public Supply Well Vulnerability Under California’s Sustainable Groundwater Management Act
Pacific Institute | June 1, 2021...
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Base of fresh ground water (approximately 3,000 micromhos) in the San Joaquin Valley, California

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Base of fresh ground water (approximately 3,000 micromhos) in the San Joaquin Valley, California
U.S. Geological Survey (USGS) | June 30, 1971...
Summary
Widespread pumping of groundwater in the San Joaquin Valley began about 1900, and since 1940 pumpage has increased at an accelerated rate. In...
Widespread pumping of groundwater in the San Joaquin Valley began about 1900, and since 1940 pumpage has increased at an accelerated rate. In response to the heavy withdrawal of groundwater, water levels have declined rapidly beneath extensive areas of the valley. Consequently, it becomes necessary to delineate the base of fresh groundwater so that changes in thickness of the fresh-water zone can be monitored, and limited depths of water wells can be determined. In turn, those data will be useful in determining favorable areas for groundwater storage, and areas and depths for waste-water disposal wells. Because other agencies and the U.S. Geological Survey have collected a vast amount of well log and other data, most of the information in this report was assembled from existing files. However, for areas where data were scanty, a few hundred additional electrical logs were collected to supplement the available information.

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Bulletin 39-A, South Coastal Basin Investigation, Records of Ground Water Levels at Wells for the Year 1932, Seasonal Precipitation Records to and including 1931-32

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Bulletin 39-A, South Coastal Basin Investigation, Records of Ground Water Levels at Wells for the Year 1932, Seasonal Precipitation Records to and including 1931-32
California Department of Water Resources (DWR) | January 2, 1933...
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Bulletin No. 39, South Coastal Basin Investigation, Records of Ground Water Levels at Wells

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Bulletin No. 39, South Coastal Basin Investigation, Records of Ground Water Levels at Wells
California Department of Water Resources (DWR) | December 1, 1932...
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